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Regulatory Matters - Schedule of Regulatory Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | $ 2,146,270 | $ 2,333,351
Regulatory liabilities (Note 4) | 226,989 | 271,575
Total non-current regulatory liabilities | 1,919,281 | 2,061,776
Asset retirement obligations |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 343,998 | 354,002
Other postretirement benefits |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 234,832 | 270,604
Removal costs |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 96,698 | 106,889
Income taxes — change in rates |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 61,879 | 64,806
Income taxes — deferred investment tax credit |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 67,440 | 48,035
Four Corners coal reclamation |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 54,275 | 52,592
Spent nuclear fuel |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 33,616 | 39,217
Renewable energy standard (b) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 37,624 | 35,720
Demand side management (b) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 23,706 | 8,461
Sundance maintenance |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 19,215 | 16,893
Property tax deferral (e) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 12,018 | 15,521
FERC transmission true up (b) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 6,087 | 22,895
Tax expense adjustor mechanism (b) (e) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 4,835 | 4,835
Deferred fuel and purchased power — mark-to-market (Note 7) |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 0 | 96,367
Other |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 6,128 | 3,092
ACC | Excess deferred income taxes - Tax Act |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | 929,420 | 971,545
FERC | Excess deferred income taxes - Tax Act |  |
Detail of regulatory liabilities |  |
Regulatory liability, including deferred fuel and purchased power regulatory liability current | $ 214,499 | $ 221,877

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